diff --git a/format.h b/format.h
index 134730ef..24dddd69 100644
--- a/format.h
+++ b/format.h
@@ -29,7 +29,7 @@
 #define FORMAT_H_
 
 #include <cstddef>
-#include <cstdio>>
+#include <cstdio>
 #include <cstring>
 #include <stdexcept>
 #include <string>